Home / 20,687.51-28,515.57-13,970.99

Finding the Fourth Proportional to 20,687.51, 28,515.57 and 13,970.99

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Solution

The fourth proportional to 20,687.51, 28,515.57 and 13,970.99 is: 19,257.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.51 : 28,515.57 = 13,970.99 : x
  2. Step 2: Convert to fraction form
    20,687.51/28,515.57 = 13,970.99/x
  3. Step 3: Cross multiply
    20,687.51x = 28,515.57 × 13,970.99
  4. Step 4: Simplify right side
    20,687.51x = 398,390,743.31
  5. Step 5: Solve for x
    x = 398,390,743.31/20,687.51
  6. Step 6: Final answer
    x = 19,257.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.